Malicious PDF — malware analysis report

Static analysis result for SHA-256 a048c65feea62bc8…

MALICIOUS

PDF

77.3 KB Created: 2021-08-11 20:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9bb17b0e3c2dc209650f2058d35efbc SHA-1: cf93c4cf077a19784014541309badac2a1b5a8f9 SHA-256: a048c65feea62bc85bdc0b35f826505a5cccdfb559bca25b210ac3f7fa731bb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/abt55itbshu3s8p91htj5p1pr0/64573479450.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6d255e58---48339740034.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/834e09e3191a78f596c81ab41340ba7a/70141445969.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jaroxinexejujore.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/66312083789.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657a8060b2---getuwukoris.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0c9541a0---gibifediberufujiloxazer.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/komududaponewawovezoz.pdfIn PDF document text
    • http://strap.sk/uploads/file/xepepowonufatavet.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/matet.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c92541d93bdc5a27674dcf6d89fea000/213171808.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c9c4668bdb69237cc2e98291b8b37723/50745880229.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160725ee9b07b8---58513485872.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/26158212793.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/duvorasazekusekilowovu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b0991157d12a0b896970b25e8c22ac33/fuxomobafodizonegajeko.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/16577486631.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/aa8ca2a493882796d8b763e214fb8ecf/vikemojetuzakilujuginik.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14d73a9f1---vunopajajevarepojawap.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608756dd6832f---88195441938.pdfIn PDF document text
    • http://www.agot.pl/upload/file/megudidap.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r05co7ap3ja9o7dohfd80buv07/gutenuseluraviwuzelix.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/rigezatopiwoxijimazij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=oxido+de+litio+nomenclatura+iupacPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 17132 bytes
SHA-256: 706425988cf0b51f5ae3378d3596fc3b1de535ad397bf3ab2e6a4a1afd6b3080
font_02_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10732 bytes
SHA-256: 9dd405125bb04f3c1480653899d00a24a130d434563a51b921ab36c0ab71efe9

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